It’s a 2×3 Inches General Purpose Printed Circuit Zero Board. This is commonly known as Perf Board, Practice Board, General Purpose PCB, and Zero Board. The plated holes are pre-tinned/pre-coppered and very solid, making them very easy to solder components on. It is Widely Used For Electronic Projects. Features  Actual size: 2x3inch This Is A Single-Sided Fr2 / Phenolic General Purpose PCB It Is Used For Rapid Prototyping Design Copper Layer Is Laminated For Easy Soldering And To Prevent Corrosion Widely Used For Electronic Projects. This is commonly known as Perf Board, Practice Board, General Purpose PCB, Zero Board.